selftests/liveupdate: Add stress-files kexec test

Add a new luo_stress_files kexec test that verifies preserving and
retrieving 500 files across a kexec reboot.

Reviewed-by: Pratyush Yadav (Google)

selftests/liveupdate: Add stress-files kexec test

Add a new luo_stress_files kexec test that verifies preserving and
retrieving 500 files across a kexec reboot.

Reviewed-by: Pratyush Yadav (Google) <pratyush@kernel.org>
Acked-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
Signed-off-by: Pasha Tatashin <pasha.tatashin@soleen.com>
Link: https://patch.msgid.link/20260603154402.468928-14-pasha.tatashin@soleen.com
Signed-off-by: Mike Rapoport (Microsoft) <rppt@kernel.org>

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